There are two things. First, perhaps you are related to her mother. Look at the mothers profile and see if she is a relation.
Second, those are pretty distant ancestors. At a certain point, the DNA connection stops populating, so perhaps this ancestor is so distant, wikitree doesn't think they are useful. My 5G ancestors show my name so I am not sure where they stop . My 6th cousin, who shows up as a DNA match on a few sites, does not show up as a DNA connection on Wikitree, but if I go to our shared ancestor, her name is listed there as a possible AU relative.